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Mass Erosion
Erosion of the Earth due to the force of
Gravity
Video Clip
1)Watch the clip for the effects of erosion.
Discussion
•What tragedy did the clip describe?
•Why did this occur?
•What force created the landslide?
•How does this relate to erosion?
Graphic Organizer
1) Head the worksheet.
2) Fill in the worksheet while viewing the
power point.
Mass Erosion
• …is the downhill movement of weathered
materials
• …is caused by gravity
• … can occur quickly or slowly
Quick Mass Erosion
Landslide:
• Sudden movement of rocks down a hill
• Rock can be loosened by volcanic activity, earthquakes,
or heavy rain
• The pile of rocks at the bottom of a landslide is called a
TALUS pile.
***Watch Outrunning a Landslide Video***
Example of Mass Erosion
Example of Landslide
Quick Mass Erosion
Mudflow:
• Sudden flow of mud down a hill
• Occur in dry, mountainous regions after a heavy rainfall
Example of Mudflow
Example of Mudflow
Slow Mass Erosion
Earthflow:
• Slow movement of soil, rocks, and plant life down a hill
• Caused by loose earth and extra moisture as well as
gravity
• Part of a hill looks like it is sliding away
Example of Earthflow
Example of Earthflow
Slow Mass Erosion
Creep:
• Slowest form
• Gravity pulling soil and rocks down a gentle slope
• Clues: Bent trees or telephone poles
Examples of Creep
Examples of Creep
Strange But True Rock
Slide
• When: January 21 and 23, 2014
• Where: Northern Italy
• Result of a series of sudden landslides
• The house in the picture is a 300 year old
farmhouse.
Giant Boulder Destroys 300 yr.
Old Farmhouse Barn
Just How Big and Close
Was This Boulder?
Closure:
What force causes mass erosion?
Name three causes of a landslide?
Which Type of Mass Erosion Is
This?
• Creep
Which type of mass erosion
buried this Indonesian temple?
• Mudflow
What do we call the pile of rock
at the bottom of the hill?
• Talus Pile